Specifications

Triggering the
Sweep
The output
of
the
Sync
Separator
is
fed
directly
to the
A Sweep
Trigger circuit; all that
is required
for
triggering
is
the
proper
setting of the
A
TRIGGER
LEVEL
control.
To trigger the B Sweep
from
the
Line-rate
trigger output,
perform
the
following steps:
1.
Make sure
the A Sweep
is running.
NOTE
The B
Sweep
cannot
be operated independently
and
cannot run more
than once
per
operation
of the A
Sweep.
For
Composite
line
displays, refer
to
Special
Measurements in this section.
2. Set the B TRIGGER SOURCE switch
to
TV LINE.
3. Set the B TRIGGER LEVEL
control
for
a stable
triggered
sweep.
Vertical Operating
Modes-Speciat
Considerations
DUAL
TRACE MODES.
For
dual trace operation, the
Sync Separator
input
must
be taken
from
CH 1
,
CH 2, or
an
external
source.
(When
only one trace
is
displayed, the
NORM
position
of
the A
TRIGGER
SOURCE switch
may
be
used.) The
Sync
Separator
is not capable
of
correct
processing
of
switched
(composite
vertical
deflection) wave-
forms
present
on the
NORM
bus in the
ALT or CHOP
modes;
it is therefore
not
possible
to obtain
stable
simultaneous
displays
of
two independent video
signals
that
are
not
time-related.
SINGLE
CHANNEL TRIGGERING.
When
triggering
from
Channel
1 or Channel
2,
the waveform
fed
to
the
Sync
Separator
is the same
(except
for
positioning)
as
that
displayed on-screen
when
the channel is turned on. lf the
VOLTS/DIV VAR
control
is
used
to
reduce displayed
amplitude, the signal
to the
Sync Separator
is
also
reduced.
When the
Channel2INVERT switch
is
pushed
in, the
CH 2
signal
to
the A
TRIGGER
SOURCE
switch
is also in-
verted.
Therefore,
in
selecting the
position
of the A TRIG-
GER
SLOPE switch
in
internal
triggering,
it is
only
necessary
to
note
the
polarity
of the displayed
waveform,
disregarding
its
actual
polarity
as applied to the Vertical
input
connector.
For
external
triggering, the actual
applied
polarity
will determine the necessary
A TRIGGER
SLOPE
setting.
@
102
4658/DM44
Operators